[χαλκηδών] from G5475 and perhaps G1491; copper-like, i.e. "chalcedony"
Usages throughout the bible
Revelation 21:19
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And the foundations of the wall of the city were garnished with all manner of precious stones. The first foundation was jasper; the second, sapphire; the third, a chalcedony; G5472 the fourth, an emerald;